Mill



w w 9 l m m M 7 6 w 1 W J a a z .0 2

1 1 fi. w O 00000000000000 00 a N 9 Z A 19 M 9 2 f 1 Wm v 2 5 B M w@0233 J w 5 L n QOOOOOOQOOG 000099 Nov. 29, 1927.

Nov. 29, 1927. 1,651,319

J. w. BOWMAN MILL Filed July 19. 1926 2 Sheets-Sheet 2 mar J @IENTORATTO R N EY WITNESS:

Patented Nov. 29, 1927.

Application filed July 19,

This invention relates to improvements in grinding mills especiallydesigned for grind-- ing feed and has for an object the provision of amill of the hammer type having hammer grinding arms of novel formationarranged to provide a grinding cylinder w ose grinding elements Wlll beso positioned that an imaginary line parallel with the axis of I thecylinder will be out by said grinding elements throughout the length ofthe cylinder and all of the materialwithin the mill will thus be actedupon.

Another object of the invention is the provision of a mill which inaddition to the above and other advantages, is simple of constructionand may be easily taken apart and reassembled for purposes of repair.

With the above and other objects in view, j

the invention further includes the followingnovel features and detailsof construction, to be hereinafter more fully described, illustrated inthe accompany' g drawings and 1 pointed out in the appended claims.

In the drawings Figure 1 is an elevation of a grinding mill constructedin accordance with the invention.

Figure 2 is a section taken'substantially on the. line 22 of Figure 3.

Figure '3 is a section on the line 33 of Figure 1.

Figure 4 is a detail edge view of one of the intermediate grindinghammers.

Figure 5 is an edge view of the hammer 85 shown in Fi re 4.

Figure 6 1s a detail perspective view of one of the end hammers.

Referring to the drawings in detail wherein like characters of referencedenote corre sponding parts, the mill is shown as comprising a casingwhich includes a hopper .or container 10 constructed of sheet metal withthe side and end walls bolted to ether and supported upon legs 11. A sustantially semi-cylindrical foraminous bottom 12 is provided for thecontainer. A hood'cover 13 is secured as shown at 14, and islikewiseformed of sheet metal. and has one ed e spaced above the top ofthe container y means of a support 15:

Mounted for rotation within the casing is a shaft 16 which is designedto be ,driven at high speed and for this purpose. is provided 1926-.Serial No. 123,453.

with a pulley 17 which.may be connected with a suitable source of power.i

Mounted upon the shaft 16 is a grinding cylinder and the lattercomprises radially extending-arms18 and 19. These arms are formed offlat metallic plates as shown in Figures 4, 5 and def the drawings andare provided with openings-2O for the passage of .the shaft 16. The arms19 which are located ateach end of the cylinderhave their outer endsbent to provide outwardly substantially right larl grinding elements 21.he intermediate arms 18 have their outer ends slitted and the materialbetween these slits arranged to provide grinding elements 22, 23 and 24.The grinding elements 22 are disposed in a line with the arms 18, whilethe elements 23 and 24 are reversel as to extend laterall from the arms.

The arms are separated by spacing washers 25 and the space between thearms is such' extending or oppositely oflset so y in opposite directionsv that the offset grinding elements 23 and 24 will extend outward asuificient distance to cut the entirelength of an imaginary lineparallel with the axis of the inding cylin der, when the latter isrotate Thus all of the feed or material within thecasing will be acted uon during the rotation of the grinding cy inder. The shaft 16isreversely threaded as shown at 26 and the arms are frictionally heldthereon by-means of lock nuts 27. As the arms are frictionally mountedthey would give in the event of a metallic or hard substance beinginadvertently put into the millv and thus materially reduce danger ofdamage to said mill- I The configuration of the cover 13 and the mannerof supporting the same provides an entrance mouth for the receptacle.This month isprovided at its lower edge with an inwardly curved lip127and is designed to be closed by a gate or valve 28. The gate or valve 28is pivotally mounted as at 29 and is normally closed by gravity.' A feedplate 30 is inclined downwardly toward-the lower edge of the mouth sothat the material may pass into the receptacle beneath the detai s ofconstruction and the right is herea in reserved to make such ohan es asproperly fall within the scope of e appended claim. e

Having described the invention what is I claimed is:

A mill comprising a. housing, a shaft mounted for rotation therein,spaced radially extendin arms secured upon said shaft, the outer en s ofthe arms having transversely spaced longitudinal slits therein at 10 andlaterally and one tooth disposed in line with the arm and a. foraminousbottom for 15 the casing.

In testimony whereof I aflix m signature.

JOHN W. B WMANW-

